CVE-2021-32745Network attack vector

Session token theft via unescaped iframe HTML

Published Jul 21, 2021 · Updated Aug 3, 2024

Reflected XSS in Collabora Online before 6.4.9-5 allows remote attackers to execute script in an editor iframe via crafted HTML. The iframe creation path inserts an attacker-controlled variable into HTML without escaping, so the browser interprets injected markup as active content. Execution occurs in the iframe's Collabora Online context and exposes its browser-stored settings and session authentication token.

CVSS severity7.3
High
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Collabora Online before 6.4.9-5 allows remote attackers to execute script in an editor iframe via crafted HTML. The iframe creation path inserts an attacker-controlled variable into HTML without escaping, so the browser interprets injected markup as active content. Execution occurs in the iframe's Collabora Online context and exposes its browser-stored settings and session authentication token.

The record

CVE
CVE-2021-32745
Published
Jul 21, 2021
Updated
Aug 3, 2024
Vendor
Collabora Productivity
Product
Collabora Online
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2021CVE 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

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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=< 6.4.9-5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Collabora Productivity · Collabora Onlineversion=< 6.4.9-5

Published CVSS scores

7.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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