CVE-2025-20236: A vulnerability in the custom URL parser of Cisco Webex App could allow an unauthenticated, remote attacker to

This month

HIGH 8.8DOWNGRADE

CVE-2025-20236 is a high-severity flaw (CVSS 8.8) affecting webex teams. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in the custom URL parser of Cisco Webex App could allow an unauthenticated, remote attacker to persuade a user to download arbitrary files, which could allow the attacker to execute arbitrary commands on the host of the targeted user. This vulnerability is due to insufficient input validation when Cisco Webex App processes a meeting invite link. An attacker could exploit this vulnerability by persuading a user to click a crafte

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-829
Published	2025-04-16
Last modified	2026-06-17

Publisher (CNA): Cisco Systems, Inc. · Vendor: cisco

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-04-16 17:15 UTCPublished CVE record published
2026-06-17 08:41 UTCUpdated Record last modified

cisco webex teams DOWNGRADE

Affected: 44.6 · 44.6.0.29928 · 44.6.0.30148 · 44.7 · 44.7.0.30141 · 44.7.0.30285

Fixed in: no fixed release known

Safe to downgrade to: a release before 44.6

1. Check installed version

apt-cache policy webex-teams || rpm -q webex-teams || webex-teams --version

2. No fixed release: DOWNGRADE to a release before 44.6 (Debian / Ubuntu)

apt-cache madison webex-teams sudo apt install webex-teams=<VERSION_BEFORE_44.6> sudo apt-mark hold webex-teams

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list webex-teams sudo dnf downgrade webex-teams-<VERSION_BEFORE_44.6> sudo dnf versionlock add webex-teams

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-20236?

webex teams: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-20236 being exploited?

CVE-2025-20236 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-20236 affect?

CVE-2025-20236 affects webex teams. Severity is high (CVSS 8.8). A vulnerability in the custom URL parser of Cisco Webex App could allow an unauthenticated, remote attacker to persuade a user to download arbitrary files, which could allow the attacker to execute arbitrary commands on the host of the targ

How urgent is CVE-2025-20236?

Priority 46/100. High severity

Software pages

Cisco vulnerabilities · Cisco Webex vulnerabilities

Related CVEs

CVE-2024-20396 MEDIUM 5.3 DOWNGRADE A vulnerability in the protocol handlers of Cisco Webex App could allow an unauthenticated, remote attacker to
CVE-2024-20395 MEDIUM 6.4 DOWNGRADE A vulnerability in the media retrieval functionality of Cisco Webex App could allow an unauthenticated, adjace
CVE-2020-26067 MEDIUM 5.4 MITIGATE A vulnerability in the web-based interface of Cisco Webex Teams could allow an authenticated, remote atta

References

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