CVE-2026-21430Public exploitNetwork attack vector

Account takeover via tokenless stored-XSS article publishing

Published Jan 2, 2026 · Updated Jan 2, 2026

Cross-site request forgery in emlog 2.5.23 allows remote attackers to publish stored-XSS articles through authenticated users' browsers. The article_save.php endpoint accepts a cross-origin POST without a CSRF token and stores unsanitized logcontent for later rendering. A victim must be signed in and load an attacker-controlled page; viewing the resulting post executes script that can steal session cookies and take over the account.

CVSS severity9.3
Critical
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in emlog 2.5.23 allows remote attackers to publish stored-XSS articles through authenticated users' browsers. The article_save.php endpoint accepts a cross-origin POST without a CSRF token and stores unsanitized logcontent for later rendering. A victim must be signed in and load an attacker-controlled page; viewing the resulting post executes script that can steal session cookies and take over the account.

The record

CVE
CVE-2026-21430
Published
Jan 2, 2026
Updated
Jan 2, 2026
Vendor
emlog
Product
emlog
Classifications
CWE-352, CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion== 2.5.23

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

emlog · emlogversion== 2.5.23

Published CVSS scores

7.0GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N/E:P
9.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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