# CVE-2026-115640: LimeSurvey Community Edition 7.7.0 - Stored XSS in Central Participants blocklist control

Status: published. Published: 2026-11-10. Updated: 2026-11-10.

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.

## Remediation

- fix: Upgrade to LimeSurvey Community Edition 7.9.0 or later; the vendor patch validates newly imported participant IDs and encodes ButtonGroupWidget attributes. (source: CNA: Fluid Attacks)
- workaround: Restrict CPDB Import and Update permissions and remove suspicious participant IDs until upgrade completion. (source: CNA: Fluid Attacks)
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: Fluid Attacks) — https://github.com/LimeSurvey/LimeSurvey/commit/4cd281828422abf94468052016eba8897d5ec9aa

## Affected products and versions

- LimeSurvey / LimeSurvey Community Edition: ≥ 3.0.0; ≤ 7.7.0 (affected, semver). Source: CNA: Fluid Attacks; platforms: Windows, MacOS, Linux

## Severity and prioritization

- CVSS 4.0: 7.4 (high); 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; source: CNA: Fluid Attacks

- CVSS 4.0: 7.4 (high); 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: help@fluidattacks.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-79

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://fluidattacks.com/es/advisories/angel (CNA: Fluid Attacks; third-party-advisory)

- https://github.com/LimeSurvey/LimeSurvey/ (CNA: Fluid Attacks; product)

- https://github.com/LimeSurvey/LimeSurvey/commit/4cd281828422abf94468052016eba8897d5ec9aa (CNA: Fluid Attacks; patch)

- https://github.com/LimeSurvey/LimeSurvey/releases/tag/7.9.0+261029 (CNA: Fluid Attacks; release-notes)

- https://fluidattacks.com/es/advisories/angel (help@fluidattacks.com)

- https://github.com/LimeSurvey/LimeSurvey/ (help@fluidattacks.com)

- https://github.com/LimeSurvey/LimeSurvey/commit/4cd281828422abf94468052016eba8897d5ec9aa (help@fluidattacks.com)

- https://github.com/LimeSurvey/LimeSurvey/releases/tag/7.9.0+261029 (help@fluidattacks.com)

## Provenance

- CNA: Fluid Attacks: https://www.cve.org/CVERecord?id=CVE-2026-115640; retrieved 2026-11-10; source updated 2026-11-10

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-115640; retrieved 2026-11-10; source updated 2026-11-10

Revision: 3ef41f731d759b73d0b076ac4a176a377ca06bea913f7b55297ce277a0c0e26f

Canonical: https://y2.dev/cve/CVE-2026-115640

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.