CVE-2026-36761Public exploitNetwork attack vector

Stored XSS via regex filter bypass

Published Apr 30, 2026 · Updated Apr 30, 2026

Stored XSS in JeeSite 5.15.1 and earlier allows remote authenticated users to run scripts in a recipient's browser via crafted messages. EncodeUtils.java applies an incomplete regex blacklist to msgContent, then the message view renders the surviving HTML with Vue v-html. Message-sending permission and a recipient opening the stored message are required; execution can access same-origin cookies, DOM data, and APIs.

CVSS severity6.1
Medium
EPSS probability0.15%
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 JeeSite 5.15.1 and earlier allows remote authenticated users to run scripts in a recipient's browser via crafted messages. EncodeUtils.java applies an incomplete regex blacklist to msgContent, then the message view renders the surviving HTML with Vue v-html. Message-sending permission and a recipient opening the stored message are required; execution can access same-origin cookies, DOM data, and APIs.

The record

CVE
CVE-2026-36761
Published
Apr 30, 2026
Updated
Apr 30, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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