CyberSecBulletin
CVE-2026-13974NVD status: Modified

Chrome: External Control of Assumed-Immutable Web Parameter

Published Updated By the CyberSecBulletin desk

CVE-2026-13974 is a high-severity external control of assumed-immutable web parameter vulnerability in Chrome from Google, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. The record lists version 150.0.7871.47 as the first without the flaw, so updating Chrome to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.29% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Chrome to 150.0.7871.47 or a later version.
  2. Read the advisory on chromereleases.googleblog.com for workarounds and exact fixed builds.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
  4. Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.

Affected products and versions

VendorProductAffected versionsFixed in
GoogleChrome150.0.7871.47 up to, but not including, 150.0.7871.47150.0.7871.47

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
RequiredA user must take an action such as opening a file or link.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
NoneNo data is disclosed.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H. Scored by CISA (ADP).

Official description

Integer overflow in Safe Browsing in Google Chrome on Mac prior to 150.0.7871.47 allowed a remote attacker to bypass navigation restrictions via a malicious file. (Chromium security severity: Medium)

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: External Control of Assumed-Immutable Web Parameter

The web application does not sufficiently verify inputs that are assumed to be immutable but are actually externally controllable, such as hidden form fields.

How developers prevent this class of flaw

  • Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.

More External Control of Assumed-Immutable Web Parameter vulnerabilities (CWE-472)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other references

Other vulnerabilities in Chrome

All Chrome vulnerabilities

Recent External Control of Assumed-Immutable Web Parameter vulnerabilities

Spotted an error? Tell us.