HOMEVULNERABILITIESCVE-2026-45243
MEDIUM

CVE-2026-45243

CWE-862Published: May 18, 2026· Updated: May 19, 2026

6.1
CVSS v3.1
EPSS:0.03%probability of exploitation in 30 daysPercentile:7.0th

Official Description

Summarize prior to 0.15.1 contains a missing authorization vulnerability in the content script window.postMessage bridge that allows malicious pages to perform unauthorized operations on automation artifacts. Attackers can simulate runtime messages with spoofed sender identifiers to list, read, create, overwrite, or delete automation artifacts scoped to the affected tab without proper authorization checks.

NVD Source

Technical Analysis

CVE-2026-45243 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeChanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected Vendors & Products

steipete1 product
summarize
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/steipete/summarize/commit/357544063af535bd574752622f9eb94be33ee5fd
PATCHhttps://github.com/steipete/summarize/pull/222
ADVISORYhttps://www.vulncheck.com/advisories/summarize-browser-extension-missing-authorization-via-content-script

All References (4)

→
https://github.com/steipete/summarize/commit/357544063af535bd574752622f9eb94be33ee5fdPatch
→
https://github.com/steipete/summarize/pull/222Exploit · Issue Tracking · Patch
→
https://github.com/steipete/summarize/releases/tag/v0.15.2Release Notes
→
https://www.vulncheck.com/advisories/summarize-browser-extension-missing-authorization-via-content-scriptThird Party Advisory

Quick Facts

CVE IDCVE-2026-45243
CVSS Score6.1 / 10
SeverityMEDIUM
WeaknessCWE-862
CISA KEVNo
EPSS (30d)0.03%
Affected1 vendor
PublishedMay 18, 2026

Related CVEs (CWE-862)

CVE-2025-30416
10.0
CVE-2026-0092
10.0
CVE-2026-2031
10.0
CVE-2026-33712
10.0
CVE-2026-34976
10.0
CVE-2026-44442
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-45243 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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