SiteServer SSCMS Admin-Login CAPTCHA LoginController.Submit.cs LoginController.Submit excessive authentication

published 2026-11-09 3d ago modified 2026-11-09 3d ago also EUVD-2026-119863

cvss: 3.7; 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

A vulnerability was identified in SiteServer SSCMS up to 7.1.3/7.2.1/7.4.0. This issue affects the function LoginController.Submit of the file src/SSCMS.Web/Controllers/Admin/LoginController.Submit.cs of the component Admin-Login CAPTCHA. Such manipulation of the argument isForceLogoutAndLogin leads to improper restriction of excessive authentication attempts. It is possible to launch the attack remotely. A high complexity level is associated with this attack. The exploitability is assessed as difficult. The name of the patch is df3becb7ebb00a48435418a44fd08a459eb38ace. Applying a patch is advised to resolve this issue.

Patch / fix

links 2

github.com/siteserver/cms@df3becb commit
github.com/siteserver/cms#3905 pull request

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Exploit prediction

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

CVSS scores

assigned by	version	score	vector
CNA	4.0	6.3	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X
CNA	3.1	3.7	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:X/RL:O/RC:C
CNA	3.0	3.7	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:X/RL:O/RC:C
CNA	2.0	2.6	AV:N/AC:H/Au:N/C:P/I:N/A:N/E:ND/RL:OF/RC:C
CNA	4.0	6.3	CVSS:4.0/AV:N/AC:H/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
NVD	3.1	3.7	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA	2.0	2.6	AV:N/AC:H/Au:N/C:P/I:N/A:N

Affected products

SiteServer SSCMS

Classification

Weakness

CWE-307 Improper Restriction of Excessive Authentication Attempts
CWE-799 Improper Control of Interaction Frequency

References

github.com /siteserver/cms/pull/3905
issue-tracking, patch
github.com /siteserver/cms/commit/df3becb7ebb00a48435418a44fd08a459eb38ace
patch
vuldb.com /vuln/432921
vdb-entry, technical-description
vuldb.com /vuln/432921/cti
signature, permissions-required
vuldb.com /cve/CVE-2026-124575
third-party-advisory
vuldb.com /submit/1038068
third-party-advisory
github.com /siteserver/cms/blob/15144f30c6cc0e11d50985b6ab9236cfce8cacbd/src/SSCMS.Web/Controllers/Admin/LoginController.
related

Sources

CVE List CVE-2026-124575
NVD CVE-2026-124575

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