Piranha CMS - Stored XSS in Page Title
Priority MEDIUM 58CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
In PiranhaCMS, versions 7.0.0 to 9.1.1 are vulnerable to stored XSS due to the page title improperly sanitized. By creating a page with a specially crafted page title, a low privileged user can trigger arbitrary JavaScript execution.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0065 51st percentileScored 2026-11-07
Fix Fixed Piranha (NuGet): 9.2.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| PiranhaCMS | Piranha | 7.0.0 and later; up to 9.1.1 | — | No fix listed | CNA |
| — | Piranha (NuGet) | 7.0.0 to before 9.2.0 | 9.2.0 | Patch available | GHSA-jvjp-vh27-r9h5 |
- Piranha VendorPiranhaCMS Affected 7.0.0 and later; up to 9.1.1 Fixed in — No fix listed CNA
- Piranha (NuGet) Vendor— Affected 7.0.0 to before 9.2.0 Fixed in 9.2.0 Patch available GHSA-jvjp-vh27-r9h5
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:dotnetfoundation:piranha_cms:*:*:*:*:*:*:*:* | 7.0.0 – 9.1.1 | Vulnerable | Dotnetfoundation |
- cpe:2.3:a:dotnetfoundation:piranha_cms:*:*:*:*:*:*:*:* Versions 7.0.0 – 9.1.1 Vulnerable ·Dotnetfoundation
Remediation
- Fix · GHSA-jvjp-vh27-r9h5 Piranha (NuGet) Fixed in 9.2.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-25977
- 2026-10-03 Alias added: GHSA-jvjp-vh27-r9h5
- 2026-10-16 EPSS moved to the 50th–90th percentile
References
More PiranhaCMS vulnerabilities
- TI-2026-75451 Missing authorization in Piranha CMS manager language API CVSS 4.0MEDIUM 5.3
Sources
- CVE-2021-25977 · CVE Program
- CVE-2021-25977 · NVD
- FIRST EPSS
- GHSA-jvjp-vh27-r9h5 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences