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Fencer Vulns
high 7.5

CVE-2025-66507 json

1Panel – CAPTCHA Bypass via Client-Controlled Flag

published 2025-12-08 11 mo ago modified 2026-10-14 25 d ago also EUVD-2025-201793 , GHSA-qmg5-v42x-qqhq , GO-2025-4209

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

1Panel is an open-source, web-based control panel for Linux server management. Versions 2.0.13 and below allow an unauthenticated attacker to disable CAPTCHA verification by abusing a client-controlled parameter. Because the server previously trusted this value without proper validation, CAPTCHA protections can be bypassed, enabling automated login attempts and significantly increasing the risk of account takeover (ATO). This issue is fixed in version 2.0.14.

Patch / fix

  • go github.com/1Panel-dev/1Panel 2.0.14, 2.0.14+incompatible
  • go github.com/1Panel-dev/1Panel/core 0.0.0-20251128030527-ac43f00273be
  • fit2cloud 1panel 2.0.14
  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20251230T014957-150000.1.134.1

suse advisories SUSE-SU-2026:0037-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
11 mo ago

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
go github.com/1Panel-dev/1Panel
<2.0.14
<2.0.14+incompatible
2.0.14
2.0.14+incompatible
go github.com/1Panel-dev/1Panel/core
<0.0.0-20251128030527-ac43f00273be
0.0.0-20251128030527-ac43f00273be

Affected products

  • 1Panel-dev 1Panel

Classification

Weakness
  • CWE-602 Client-Side Enforcement of Server-Side Security
  • CWE-807 Reliance on Untrusted Inputs in a Security Decision
  • CWE-290 Authentication Bypass by Spoofing

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.