CVE-2026-79663 json
Ech0 before 4.7.3 Stored XSS via RSS feed tag names
published 6mo ago modified 2mo ago also EUVD-2026-65451 , GHSA-3v85-fqvh-7rxf , GO-2026-5100
- cvss
- 4.8
- 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 16%
- public exploits
- 0
- none known
Summary
Ech0 before 4.7.3 contains a stored cross-site scripting vulnerability in the public RSS feed where tag names and markdown content are rendered without HTML escaping. Attackers with admin privileges can inject malicious tag names or raw HTML in echo content that executes as JavaScript in RSS readers that render HTML-type summaries, affecting anonymous subscribers and other users.
Patch / fix
- go github.com/lin-snow/Ech0 1.4.8-0.20260503035519-fd320fe3e902
- go github.com/lin-snow/ech0 1.4.8-0.20260503035519-fd320fe3e902
- lin-snow Ech0 4.7.3
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2mo ago
Exploit prediction
0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 4.8 | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N |
| CNA | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
| GitHub | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
| CNA | 4.0 | 4.8 | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/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 |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/lin-snow/Ech0 | <1.4.8-0.20260503035519-fd320fe3e902 |
1.4.8-0.20260503035519-fd320fe3e902 |
| go | github.com/lin-snow/ech0 | <1.4.8-0.20260503035519-fd320fe3e902 |
1.4.8-0.20260503035519-fd320fe3e902 |
Affected products
- lin-snow Ech0
Classification
References
-
github.com
/lin-snow/Ech0/commit/fd320fe3e9021c8d8d284fb274775c018690520e
web
-
github.com
/lin-snow/Ech0/security/advisories/GHSA-3v85-fqvh-7rxf
vendor-advisory, web, advisory
-
vulncheck.com
/advisories/ech0-before-stored-xss-via-rss-feed-tag-names
third-party-advisory
-
github.com
/lin-snow/Ech0
package
Sources
- CVE List CVE-2026-79663
- GitHub Advisory GHSA-3v85-fqvh-7rxf
- NVD CVE-2026-79663
- OSV GO-2026-5100
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.