CVE-2023-34923: XML Signature Wrapping (XSW) in SAML-based Single Sign-on feature in TOPdesk v12.10.12 allows bad actors with

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HIGH 8.1DOWNGRADE

CVE-2023-34923 is a high-severity flaw (CVSS 8.1) affecting topdesk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

XML Signature Wrapping (XSW) in SAML-based Single Sign-on feature in TOPdesk v12.10.12 allows bad actors with credentials to authenticate with the Identity Provider (IP) to impersonate any TOPdesk user via SAML Response manipulation.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 45%)
CISA exploited list	No
Weakness	CWE-863
Published	2023-06-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: topdesk

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

Am I affected?

Timeline

2023-06-22 19:15 UTCPublished CVE record published
2026-06-17 06:04 UTCUpdated Record last modified

topdesk topdesk DOWNGRADE

Affected: 12.10.12

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.10.12

1. Check installed version

apt-cache policy topdesk || rpm -q topdesk || topdesk --version

2. No fixed release: DOWNGRADE to a release before 12.10.12 (Debian / Ubuntu)

apt-cache madison topdesk sudo apt install topdesk=<VERSION_BEFORE_12.10.12> sudo apt-mark hold topdesk

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

dnf --showduplicates list topdesk sudo dnf downgrade topdesk-<VERSION_BEFORE_12.10.12> sudo dnf versionlock add topdesk

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-2023-34923?

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

Is CVE-2023-34923 being exploited?

CVE-2023-34923 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-2023-34923 affect?

CVE-2023-34923 affects topdesk. Severity is high (CVSS 8.1). XML Signature Wrapping (XSW) in SAML-based Single Sign-on feature in TOPdesk v12.10.12 allows bad actors with credentials to authenticate with the Identity Provider (IP) to impersonate any TOPdesk user via SAML Response manipulation.

How urgent is CVE-2023-34923?

Priority 47/100. High severity; Public exploit reference

References

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