CVE-2021-26263Network attack vector

Browser script execution via unescaped notification content

Published Apr 25, 2023 · Updated Aug 3, 2024

Stored cross-site scripting in Odoo Discuss 14.0 through 15.0 allows remote attackers to execute web script through crafted messages. The notification handler converts message.body to inline text but sends the result without HTML escaping, so notification rendering interprets embedded markup. No account or click is required; execution occurs when a connected recipient receives the notification, enabling actions or data access in that browser session.

CVSS severity7.5
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored cross-site scripting in Odoo Discuss 14.0 through 15.0 allows remote attackers to execute web script through crafted messages. The notification handler converts message.body to inline text but sends the result without HTML escaping, so notification rendering interprets embedded markup. No account or click is required; execution occurs when a connected recipient receives the notification, enabling actions or data access in that browser session.

The record

CVE
CVE-2021-26263
Published
Apr 25, 2023
Updated
Aug 3, 2024
Vendor
Odoo
Product
Odoo Community
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=14.0 <=15.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Odoo · Odoo Communityversion=14.0 <=15.0
Odoo · Odoo Enterpriseversion=14.0 <=15.0

Published CVSS scores

7.5OdooCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
6.1NIST NVDCVSS: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.

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 exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo