CVE-2026-81635Public exploitNetwork attack vector

Browser script execution via unescaped guide URL

Published Sep 10, 2026 · Updated Sep 10, 2026

Stored cross-site scripting in SHIRASAGI 1.14.0 through 1.20.2 allows remote authenticated users to execute script in a visitor's browser. The purpose-specific guide procedure renderer inserted link_url into an HTML anchor without validating its scheme or escaping attribute metacharacters. An attacker must sign in to the CMS, save a crafted procedure URL, and lure a visitor to display that procedure, exposing data and actions available to the visitor's browser session.

CVSS severity5.1
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 cross-site scripting in SHIRASAGI 1.14.0 through 1.20.2 allows remote authenticated users to execute script in a visitor's browser. The purpose-specific guide procedure renderer inserted link_url into an HTML anchor without validating its scheme or escaping attribute metacharacters. An attacker must sign in to the CMS, save a crafted procedure URL, and lure a visitor to display that procedure, exposing data and actions available to the visitor's browser session.

The record

CVE
CVE-2026-81635
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
SHIRASAGI Project
Product
SHIRASAGI
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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=v1.14.0 <=v1.20.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SHIRASAGI Project · SHIRASAGIversion=v1.14.0 <=v1.20.2

Published CVSS scores

5.4JPCERT/CC and IPACVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.1JPCERT/CC and IPACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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')
T1189Drive-by Compromise

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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