HOMEVULNERABILITIESCVE-2026-28281
HIGH

CVE-2026-28281

CWE-352Published: March 10, 2026· Updated: Mar 13, 2026

7.1
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:2.3th

Official Description

InstantCMS is a free and open source content management system. Prior to 2.18.1, InstantCMS does not validate CSRF tokens, which allows attackers grant moderator privileges to users, execute scheduled tasks, move posts to trash, and accept friend requests on behalf of the user. This vulnerability is fixed in 2.18.1.

NVD Source

Technical Analysis

CVE-2026-28281 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.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.1.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

instantcms1 product
instantcms
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
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Official Patches & Advisories

ADVISORYhttps://github.com/instantsoft/icms2/security/advisories/GHSA-pp43-262q-h73m

All References (1)

→
https://github.com/instantsoft/icms2/security/advisories/GHSA-pp43-262q-h73mExploit · Mitigation · Vendor Advisory

Quick Facts

CVE IDCVE-2026-28281
CVSS Score7.1 / 10
SeverityHIGH
WeaknessCWE-352
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedMar 10, 2026

Related CVEs (CWE-352)

CVE-2019-25729
9.8
CVE-2026-39619
9.6
CVE-2026-39640
9.6
CVE-2026-39620
9.6
CVE-2026-40471
9.6
CVE-2026-55742
9.6

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-28281 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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