{"items":[{"id":"NVI-00002649","kind":"vulnerability","title":"YesWiki Vulnerable to Unauthenticated ActivityPub Signature-Verification Bypass via `!openssl_verify(...)` accepting `int(-1)`","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-mv28-wj57-f57g","CVE-2026-52767"],"plain_summary":"OSV carries this publisher advisory for yeswiki/yeswiki. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 4.6.6 for yeswiki/yeswiki. Confirm the publisher’s latest guidance.","source_ids":["sr-213983385ed21c56b2741f6613853534"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-38d8a04f8f6ee693833296484dd9eef5"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-08T21:05:26.920Z","value":"8.2 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-903833a97cf9c1c44bb68c62be7f55b5"},{"kind":"EPSS","as_of":"2026-11-01T12:00:16.000Z","value":"0.352%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.28894. Missing scores are unknown.","source_id":"sr-38d8a04f8f6ee693833296484dd9eef5"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-213983385ed21c56b2741f6613853534","url":"https://github.com/advisories/GHSA-mv28-wj57-f57g","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-mv28-wj57-f57g","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:30.983Z"},{"id":"sr-903833a97cf9c1c44bb68c62be7f55b5","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52767","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-52767","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-01T07:24:31.710Z"},{"id":"sr-38d8a04f8f6ee693833296484dd9eef5","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-52767","publisher":"FIRST EPSS","observed_at":"2026-11-01T14:28:32.282Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-213983385ed21c56b2741f6613853534"],"technology":"yeswiki/yeswiki","known_exclusions":[],"conditions_summary":"## Summary\n`HttpSignatureService::verifySignature()` checks the result of PHP's `openssl_verify()` with a **loose boolean negation** - `if (!openssl_verify(...)) { throw ... }`. PHP's `openssl_verify` has four possible return values:\n\n| return | meaning                                          | `!return` |\n| ------ | ------------------------------------------------ | --------- |\n| `1`    | signature is valid                               | `false`   |\n| `0`    | signature is invalid                             | `true` ✓  |\n| `-1`   | the verify call itself failed (internal error)   | **`false` ❌** |\n| `false`| input rejected by PHP's argument validation      | `true` ✓  |\n\nThe `-1` row is the bypass: PHP's truthiness rules make `-1` a truthy value, so `!(-1) === false`, the throw is skipped, and the controller proceeds to `processActivity()`. Any condition that makes OpenSSL's `EVP_VerifyFinal()` return `-1` triggers the bypass.\n\nThe two practical paths to `-1` we are aware of:\n\n1. **DSA / EC public key with an RSA-only algorithm.** `openssl_verify(..., $dsaKey, \"RSA-SHA256\")` returns `int(-1)` on PHP 8.3 + OpenSSL 3.x. This is the path the PoC uses; it works against an unmodifie","public_affected_ranges":["ECOSYSTEM: introduced 4.6.2; fixed 4.6.6"]}],"null_published_at":"2026-11-08T19:53:48.754Z","source_updated_at":"2026-07-09T21:11:38.965Z","source_disclosed_at":"2026-07-09T20:58:12.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:42:30.983Z"},{"id":"NVI-00002649","kind":"vulnerability","title":"YesWiki Vulnerable to Unauthenticated ActivityPub Signature-Verification Bypass via `!openssl_verify(...)` accepting `int(-1)`","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-mv28-wj57-f57g","CVE-2026-52767"],"plain_summary":"OSV carries this publisher advisory for yeswiki/yeswiki. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 4.6.6 for yeswiki/yeswiki. Confirm the publisher’s latest guidance.","source_ids":["sr-213983385ed21c56b2741f6613853534"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-903833a97cf9c1c44bb68c62be7f55b5"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-08T21:05:26.920Z","value":"8.2 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-903833a97cf9c1c44bb68c62be7f55b5"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-213983385ed21c56b2741f6613853534","url":"https://github.com/advisories/GHSA-mv28-wj57-f57g","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-mv28-wj57-f57g","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:30.983Z"},{"id":"sr-903833a97cf9c1c44bb68c62be7f55b5","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52767","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-52767","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-01T07:24:31.710Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-213983385ed21c56b2741f6613853534"],"technology":"yeswiki/yeswiki","known_exclusions":[],"conditions_summary":"## Summary\n`HttpSignatureService::verifySignature()` checks the result of PHP's `openssl_verify()` with a **loose boolean negation** - `if (!openssl_verify(...)) { throw ... }`. PHP's `openssl_verify` has four possible return values:\n\n| return | meaning                                          | `!return` |\n| ------ | ------------------------------------------------ | --------- |\n| `1`    | signature is valid                               | `false`   |\n| `0`    | signature is invalid                             | `true` ✓  |\n| `-1`   | the verify call itself failed (internal error)   | **`false` ❌** |\n| `false`| input rejected by PHP's argument validation      | `true` ✓  |\n\nThe `-1` row is the bypass: PHP's truthiness rules make `-1` a truthy value, so `!(-1) === false`, the throw is skipped, and the controller proceeds to `processActivity()`. Any condition that makes OpenSSL's `EVP_VerifyFinal()` return `-1` triggers the bypass.\n\nThe two practical paths to `-1` we are aware of:\n\n1. **DSA / EC public key with an RSA-only algorithm.** `openssl_verify(..., $dsaKey, \"RSA-SHA256\")` returns `int(-1)` on PHP 8.3 + OpenSSL 3.x. This is the path the PoC uses; it works against an unmodifie","public_affected_ranges":["ECOSYSTEM: introduced 4.6.2; fixed 4.6.6"]}],"null_published_at":"2026-11-04T18:04:03.197Z","source_updated_at":"2026-07-09T21:11:38.965Z","source_disclosed_at":"2026-07-09T20:58:12.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T21:42:30.983Z"},{"id":"NVI-00002649","kind":"vulnerability","title":"YesWiki Vulnerable to Unauthenticated ActivityPub Signature-Verification Bypass via `!openssl_verify(...)` accepting `int(-1)`","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-mv28-wj57-f57g","CVE-2026-52767"],"plain_summary":"OSV carries this publisher advisory for yeswiki/yeswiki. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 4.6.6 for yeswiki/yeswiki. Confirm the publisher’s latest guidance.","source_ids":["sr-213983385ed21c56b2741f6613853534"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-213983385ed21c56b2741f6613853534","url":"https://github.com/advisories/GHSA-mv28-wj57-f57g","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-mv28-wj57-f57g","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:30.983Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-213983385ed21c56b2741f6613853534"],"technology":"yeswiki/yeswiki","known_exclusions":[],"conditions_summary":"## Summary\n`HttpSignatureService::verifySignature()` checks the result of PHP's `openssl_verify()` with a **loose boolean negation** - `if (!openssl_verify(...)) { throw ... }`. PHP's `openssl_verify` has four possible return values:\n\n| return | meaning                                          | `!return` |\n| ------ | ------------------------------------------------ | --------- |\n| `1`    | signature is valid                               | `false`   |\n| `0`    | signature is invalid                             | `true` ✓  |\n| `-1`   | the verify call itself failed (internal error)   | **`false` ❌** |\n| `false`| input rejected by PHP's argument validation      | `true` ✓  |\n\nThe `-1` row is the bypass: PHP's truthiness rules make `-1` a truthy value, so `!(-1) === false`, the throw is skipped, and the controller proceeds to `processActivity()`. Any condition that makes OpenSSL's `EVP_VerifyFinal()` return `-1` triggers the bypass.\n\nThe two practical paths to `-1` we are aware of:\n\n1. **DSA / EC public key with an RSA-only algorithm.** `openssl_verify(..., $dsaKey, \"RSA-SHA256\")` returns `int(-1)` on PHP 8.3 + OpenSSL 3.x. This is the path the PoC uses; it works against an unmodifie","public_affected_ranges":["ECOSYSTEM: introduced 4.6.2; fixed 4.6.6"]}],"null_published_at":"2026-10-31T22:00:33.898Z","source_updated_at":"2026-07-09T21:11:38.965Z","source_disclosed_at":"2026-07-09T20:58:12.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:42:30.983Z"}],"next_cursor":null,"snapshot_revision":"42594"}