CVE-2026-55030
MEDIUMCVSS 5.4/10EPSS 0.38%
Last modified
CVE-2026-55030 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.. EPSS estimates a 0.38% chance of exploitation in the next 30 days.
Description
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Sharepoint Server | < 16.0.19725.20434 |
| Microsoft | Sharepoint Server | 2016 |
| Microsoft | Sharepoint Server | 2019 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55030Vendor Advisory, Patch
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-55030?
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
How severe is CVE-2026-55030?
CVE-2026-55030 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.
How do I fix CVE-2026-55030?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-55025Access of resource using incompatible type ('type confusion'…7.8
- CVE-2026-55026Integer overflow or wraparound in Microsoft Office allows an…5.5
- CVE-2026-55027Out-of-bounds read in Microsoft Office allows an unauthorize…5.5
- CVE-2026-55028Out-of-bounds read in Microsoft Office allows an unauthorize…5.5
- CVE-2026-55029Heap-based buffer overflow in Microsoft Office Excel allows …7.8
- CVE-2026-5503In TLSX_EchChangeSNI, the ctx->extensions branch set extensi…9.1
- CVE-2026-55031Out-of-bounds read in Microsoft Office Excel allows an unaut…7.8
- CVE-2026-55032Use after free in Microsoft Office Word allows an unauthoriz…7.8
- CVE-2026-55033Integer overflow or wraparound in Microsoft Office Word allo…7.8
- CVE-2026-55034Improper neutralization of input during web page generation …8.7
- CVE-2026-55035Out-of-bounds read in Microsoft Office allows an unauthorize…3.3
- CVE-2026-55036Buffer over-read in Microsoft Office Excel allows an unautho…7.8
Are you affected by CVE-2026-55030?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST