VulnerabilityPublished 10 Sep 2026

CVE-2026-81635: SHIRASAGI · Cross-site Scripting (XSS)

Affects SHIRASAGISource CVE Database V5

Not known to be exploited · CVSS 5.4 Medium.

Data as of 26 Oct 2026, 12:55 UTC

CVSS 3.0 base score

5.4Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS

0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-09-10.

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required
Scope: Changed
Confidentiality: Low
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 10 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
SHIRASAGI ProjectSHIRASAGI	Affected >=1.14.0 <=1.20.2	Fixed in–

AI-suggested

Users of SHIRASAGI versions 1.14.0 through 1.20.2 should monitor the vendor's advisories for official fixes. Until a patch is available, consider applying web application firewall rules or input validation controls to mitigate XSS risks. Avoid relying on generic mitigations unless specifically applicable to this vulnerability.

Description

CVE-2026-81635 is a cross-site scripting (XSS) vulnerability in the SHIRASAGI Project's SHIRASAGI product. This flaw allows an attacker to execute arbitrary scripts in the web browser of users who visit websites running affected versions of SHIRASAGI. The vulnerability affects versions from 1.14.0 through 1.20.2. The CVSS v3.0 base score is 5.4, indicating a medium severity level. There is no information about available patches or exploits in the wild.

Impact

Successful exploitation of this XSS vulnerability could allow an attacker to execute arbitrary scripts in the victim's browser, potentially leading to theft of sensitive information such as cookies or session tokens, or manipulation of the web page content. The impact is limited to confidentiality and integrity with no availability impact. The medium CVSS score reflects these moderate risks.

Summary

The SHIRASAGI Project's SHIRASAGI product contains a cross-site scripting vulnerability identified as CVE-2026-81635. This vulnerability permits attackers to inject and execute arbitrary scripts in the context of a user's browser session when accessing a website using affected versions of SHIRASAGI (>=1.14.0 <=1.20.2). The CVSS 3.0 vector indicates the attack can be performed remotely over the network with low complexity, requiring low privileges and user interaction, and results in partial confidentiality and integrity impact without affecting availability. No public exploit code or known active exploitation has been reported.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 09:12 UTC

Technical details

References

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