CVE-2026-34229Public exploitNetwork attack vector

Stored XSS via unrestricted UBB URL scheme

Published Apr 3, 2026 · Updated Apr 3, 2026

Stored XSS in the comment module in emlog before 2.6.8 allows remote attackers to execute JavaScript via a crafted UBB URL tag. The parseUBB function in include/lib/common.php substitutes the URL-tag capture directly into an anchor href without restricting its URI scheme, so a javascript: value survives HTML escaping. Execution requires a reviewer or visitor to activate the stored link, exposing browser-accessible data and actions in that user's session.

CVSS severity6.1
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the comment module in emlog before 2.6.8 allows remote attackers to execute JavaScript via a crafted UBB URL tag. The parseUBB function in include/lib/common.php substitutes the URL-tag capture directly into an anchor href without restricting its URI scheme, so a javascript: value survives HTML escaping. Execution requires a reviewer or visitor to activate the stored link, exposing browser-accessible data and actions in that user's session.

The record

CVE
CVE-2026-34229
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
emlog
Product
emlog
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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=< 2.6.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

emlog · emlogversion=< 2.6.8

Published CVSS scores

6.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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.

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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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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