# CVE-2026-27099: Jenkins Project Jenkins

- Exploited (CISA KEV): no
- Published: 2026-02-18
- CVSS: 8 HIGH (v3.1)
- EPSS: 0.5% (41th percentile)

Jenkins 2.483 through 2.550 (both inclusive), LTS 2.492.1 through 2.541.1 (both inclusive) does not escape the user-provided description of the "Mark temporarily offline" offline cause, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Agent/Configure or Agent/Disconnect permission.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | No public claim | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2026-07-07 | 139 |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### F5

- 2026-07-07 · new · rule 200201023
  > Added: signature 200201023 "Jenkins XSS (1)" (Cross Site Scripting (XSS), risk Medium), systems: Jenkins. References: CVE-2026-27099.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog
- 2026-07-07 · new · rule 200201024
  > Added: signature 200201024 "Jenkins XSS (2)" (Cross Site Scripting (XSS), risk Medium), systems: Jenkins. References: CVE-2026-27099.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2026-27099 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2026-27099