Secuno
ENNL
Book demo

CVE-2025-55177

Meta Platforms WhatsApp Incorrect Authorization

5.4 MEDIUMActively exploited (CISA KEV)EPSS 4.73%
  1. Published29 Aug 2025
  2. Added to CISA KEV2 Sept 2025
  3. Remediation due23 Sept 2025
Actively exploited (CISA KEV)

Meta Platforms WhatsApp contains an incorrect authorization vulnerability due to an incomplete authorization of linked device synchronization messages. This vulnerability could allow an unrelated user to trigger processing of content from an arbitrary URL on a target’s device.

Added to KEV: 2 Sept 2025Federal remediation due: 23 Sept 2025

Description

Incomplete authorization of linked device synchronization messages in WhatsApp for iOS prior to v2.25.21.73, WhatsApp Business for iOS v2.25.21.78, and WhatsApp for Mac v2.25.21.78 could have allowed an unrelated user to trigger processing of content from an arbitrary URL on a target’s device. We assess that this vulnerability, in combination with an OS-level vulnerability on Apple platforms (CVE-2025-43300), may have been exploited in a sophisticated attack against specific targeted users.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected products

Whatsapp Business≥ 2.22.25.2 < 2.25.21.78
Whatsapp≥ 2.22.25.2 < 2.25.21.73 · ≥ 2.22.25.2 < 2.25.21.78

Remediation

Fixed in
Whatsapp Business≥ 2.25.21.78
Whatsapp≥ 2.25.21.73

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-163018.5
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.7 before…
CVE-2026-1095598.7
EdgeEver Desktop 1.6.26 through 1.112.0 contains a navigation allowlist bypass that…
CVE-2026-773669.9
obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian…
CVE-2026-1039038.8
An incorrect authorization vulnerability in the WinBox authentication flow of MikroTik…
CVE-2026-1087468.8
Vearch 3.5.2 through 3.5.9 contains an incorrect authorization vulnerability in…
CVE-2026-816499.1
The Fundiin cho WooCommerce WordPress plugin through 3.4.0 does not have proper…

Frequently asked

Is CVE-2025-55177 being actively exploited?

Yes. CVE-2025-55177 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2 Sept 2025.

How severe is CVE-2025-55177?

CVE-2025-55177 has a CVSS 3.1 base score of 5.4, rated medium. EPSS estimates a 4.73% probability of exploitation.

Which products are affected by CVE-2025-55177?

Affected products include Whatsapp Business, Whatsapp.

How do I fix CVE-2025-55177?

Upgrade affected software to a fixed version, for example Whatsapp Business 2.25.21.78, Whatsapp 2.25.21.73 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-55177 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.