CVE-2023-30187

CVE-2023-30187 is a critical-severity vulnerability in Onlyoffice Document Server with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

• Severity: Critical (CVSS 3.x base score 9.8)
• EPSS exploit prediction: 2% (77th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-787
• Affected product: Onlyoffice Document Server
• Published: 2023-08-14
• Last modified: 2026-07-05

Description

An out of bounds memory access vulnerability in ONLYOFFICE DocumentServer 4.0.3 through 7.3.2 allows remote attackers to run arbitrary code via crafted JavaScript file.

Frequently asked questions

What is CVE-2023-30187?

An out of bounds memory access vulnerability in ONLYOFFICE DocumentServer 4.0.3 through 7.3.2 allows remote attackers to run arbitrary code via crafted JavaScript file.

How severe is CVE-2023-30187?

CVE-2023-30187 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-30187 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-30187?

CVE-2023-30187 affects Onlyoffice Document Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-30187?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-30187 published?

CVE-2023-30187 was published on 2023-08-14 and last updated on 2026-07-05.

References

• https://gist.github.com/merrychap/25eba8c4dd97c9e545edad1b8f0eadc2
• https://github.com/ONLYOFFICE/DocumentServer
• https://github.com/ONLYOFFICE/core/blob/8ca40a44ce47a86168327a46db91253cf6bb205d/DesktopEditor/doctrenderer/
• https://github.com/ONLYOFFICE/core/blob/8ca40a44ce47a86168327a46db91253cf6bb205d/DesktopEditor/doctrenderer/embed/NativeControlEmbed.cpp#L110
• https://github.com/ONLYOFFICE/core/commit/2b6ad83b36afd9845085b536969d366d1d61150a
• http://onlyoffice.com

Affected products (1)

• cpe:2.3:a:onlyoffice:document_server:*:*:*:*:*:*:*:*

More vulnerabilities in Onlyoffice Document Server

• CVE-2023-30186 — Critical (CVSS 9.8): A use after free issue discovered in ONLYOFFICE DocumentServer 4.0.3 through 7.3.2 allows remote attackers to run…
• CVE-2022-29777 — Critical (CVSS 9.8): Onlyoffice Document Server v6.0.0 and below and Core 6.1.0.26 and below were discovered to contain a heap overflow via…
• CVE-2022-29776 — Critical (CVSS 9.8): Onlyoffice Document Server v6.0.0 and below and Core 6.1.0.26 and below were discovered to contain a stack overflow via…
• CVE-2021-25833 — Critical (CVSS 9.8): A file extension handling issue was found in [server] module of ONLYOFFICE DocumentServer v4.2.0.71-v5.6.0.21. The file…
• CVE-2021-25832 — Critical (CVSS 9.8): A heap buffer overflow vulnerability inside of BMP image processing was found at [core] module of ONLYOFFICE…
• CVE-2021-25831 — Critical (CVSS 9.8): A file extension handling issue was found in [core] module of ONLYOFFICE DocumentServer v4.0.0-9-v5.6.3. An attacker…

All CVEs affecting Onlyoffice Document Server →

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