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Fencer Vulns
medium 5.3

CVE-2026-79660 json

Ech0 before 4.7.3 Email Disclosure via Public API

published 2026-05-07 6 mo ago modified 2026-08-31 2 mo ago also GHSA-rj4g-rqgh-rx9h , GO-2026-5626 , EUVD-2026-65454

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

Ech0 versions before 4.7.3 expose guest commenter email addresses through public API endpoints due to improper JSON serialization tags on the Comment model. Unauthenticated attackers can harvest all commenter emails by calling the /api/comments and /api/comments/public endpoints without authentication.

Patch / fix

  • go github.com/lin-snow/Ech0 1.4.8-0.20260503034700-cb8d7a997dd8
  • go github.com/lin-snow/ech0 1.4.8-0.20260503034700-cb8d7a997dd8
  • lin-snow Ech0 4.7.3

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/lin-snow/Ech0/security/advisories/GHSA-rj4g-rqgh-rx9h referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/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
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
go github.com/lin-snow/Ech0
<1.4.8-0.20260503034700-cb8d7a997dd8
1.4.8-0.20260503034700-cb8d7a997dd8
go github.com/lin-snow/ech0
<1.4.8-0.20260503034700-cb8d7a997dd8
1.4.8-0.20260503034700-cb8d7a997dd8

Affected products

  • lin-snow Ech0

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-359 Exposure of Private Personal Information to an Unauthorized Actor

References

Sources

Fencer Vulns 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.