CVE-2026-53523 json
Nezha Monitoring: OAuth2 Redirect URL — Host Header Injection
published 4mo ago modified 17d ago also GHSA-9rc6-8cjv-rcvx , GO-2026-5829 , EUVD-2026-36602
- cvss
- 6.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 21%
- public exploits
- 0
- none known
Summary
Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 1.0.0 to before version 2.2.0, the getRedirectURL function in oauth2.go:22-29 constructs the OAuth2 callback URL by concatenating the request's Host header with a fixed path, with zero validation of the Host header. This can result in host header injection. This issue has been patched in version 2.2.0.
Patch / fix
- go github.com/nezhahq/nezha 2.2.0
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
Is CVE-2026-53523 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 4mo ago
Exploit prediction
0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-11).
Exploits and checks
- github.com https://github.com/nezhahq/nezha/security/advisories/GHSA-9rc6-8cjv-rcvx referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
| GitHub | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/nezhahq/nezha | >=1.0.0, <2.2.0 >=1.0.0 |
2.2.0 |
Affected products
- nezhahq nezha
Classification
- Weakness
-
- CWE-601 URL Redirection to Untrusted Site
References
-
github.com
/nezhahq/nezha/security/advisories/GHSA-9rc6-8cjv-rcvx
exploit, web, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-53523
advisory
-
github.com
/nezhahq/nezha
package
Sources
- CVE List CVE-2026-53523
- GitHub Advisory GHSA-9rc6-8cjv-rcvx
- NVD CVE-2026-53523
- OSV GO-2026-5829
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