{"id":"CVE-2026-91830","kind":"vulnerability","aliases":["CVE-2026-91830"],"related":[],"title":"WordPress Subscribe to Comments plugin: forged cookie exposes subscriber management keys","description":"The Subscribe to Comments WordPress plugin before 2.3.3 does not sign or validate a cookie it trusts to identify a commenter, allowing unauthenticated attackers to disclose a subscriber's management key and silently alter that subscriber's subscriptions.","summary":"The Subscribe to Comments WordPress plugin before 2.3.3 trusts an unsigned, unvalidated cookie to identify a commenter. An unauthenticated attacker can forge that cookie to read a subscriber's management key and change that subscriber's comment subscriptions.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","subscribe-to-comments","wordpress","wordpress-plugin"],"not_affected_if":["plugin-2.3.3-or-later","plugin-not-installed"],"how_to_check":"- Check the installed version of the Subscribe to Comments plugin in the WordPress admin under Plugins, or in `wp-content/plugins/` (version in the plugin header)\n- unknown whether other check methods are needed","fix":"- Update the Subscribe to Comments plugin to `2.3.3` or later\n- unknown whether a workaround exists before updating","status":"open","published_at":"2026-10-16T07:17:13+00:00","first_seen_at":"2026-10-23T21:57:12+00:00","triaged_at":"2026-10-25T03:57:58+00:00","updated_at":"2026-10-25T03:57:58+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-25T03:57:58Z","model":"claude-haiku-5-5","output":{"fix":"- Update the Subscribe to Comments plugin to `2.3.3` or later\n- unknown whether a workaround exists before updating","reach":"internet","title":"WordPress Subscribe to Comments plugin: forged cookie exposes subscriber management keys","impact":"low","summary":"The Subscribe to Comments WordPress plugin before 2.3.3 trusts an unsigned, unvalidated cookie to identify a commenter. An unauthenticated attacker can forge that cookie to read a subscriber's management key and change that subscriber's comment subscriptions.","category":"package","nicknames":[],"who_cares":["wordpress","wordpress-plugin","subscribe-to-comments"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker reads subscriber management keys and alters their comment subscriptions","analyst_note":"","how_to_check":"- Check the installed version of the Subscribe to Comments plugin in the WordPress admin under Plugins, or in `wp-content/plugins/` (version in the plugin header)\n- unknown whether other check methods are needed","needs_analyst":false,"not_affected_if":["plugin-not-installed","plugin-2.3.3-or-later"],"who_is_affected":"Sites running the Subscribe to Comments WordPress plugin before `2.3.3` that let visitors subscribe to comment notifications are exposed. Sites without the plugin, or with it at `2.3.3` or later, are not affected. Sources do not say whether non-default configuration changes exposure.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000614,"input_tokens":3314,"output_tokens":566,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-91830':14A,17A '2.3.3':34B,72C 'allow':86C 'alter':98C 'attack':46B,88C 'chang':59B 'comment':4A,22B,30B,43B,63B,68C,85C 'cooki':7A,39B,50B,79C 'cve':12A,15A 'disclos':90C 'expos':8A 'forg':6A,48B 'identifi':41B,83C 'key':11A,57B,95C 'manag':10A,56B,94C 'packag':18B 'plugin':5A,26B,32B,70C 'read':52B 'sign':75C 'silent':97C 'subscrib':2A,9A,20B,28B,54B,61B,66C,92C,100C 'subscribe-to-com':19B 'subscript':64B,102C 'trust':35B,81C 'unauthent':45B,87C 'unsign':37B 'unvalid':38B 'valid':77C 'wordpress':1A,23B,25B,31B,69C 'wordpress-plugin':24B","nicknames":[],"mitigations":[],"who_affected":"Sites running the Subscribe to Comments WordPress plugin before `2.3.3` that let visitors subscribe to comment notifications are exposed. Sites without the plugin, or with it at `2.3.3` or later, are not affected. Sources do not say whether non-default configuration changes exposure.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T07:17:13+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","cvss_by":"134c704f-9b21-4f2e-91b3-4a467353bcc0","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91830","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91830","severity":null,"published_at":"2026-10-16T07:17:13+00:00","modified_at":"2026-10-16T15:17:34+00:00","first_seen_at":"2026-10-23T21:57:12+00:00","fetched_at":"2026-10-23T22:28:55+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}