CVE-2026-1691 bolo-solo SnakeYAML BackupService.java importMarkdownsSync deserialization
Remote attackers can achieve code execution via unsafe deserialization in the SnakeYAML component of the bolo-solo blog platform.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-1691?
CVE-2026-1691 is a medium-severity unsafe deserialization vulnerability in bolo-solo, published on 30 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability has been found in bolo-solo up to 2.6.4. This impacts the function importMarkdownsSync of the file src/main/java/org/b3log/solo/bolo/prop/BackupService.java of the component SnakeYAML. Such manipulation leads to deserialization. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2026-1691?
It affects 1 product.
Products include Adlered Bolo-Solo.
How do I fix CVE-2026-1691?
No fix has been published for CVE-2026-1691 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-1691 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1691 exists.
Other vulnerabilities in bolo-solo
- CVE-2023-41009 File upload in n/a
- CVE-2026-1810 bolo-blog bolo-solo ZIP File BackupService.java unpackFilteredZip path traversal
- CVE-2026-1811 bolo-blog bolo-solo Filename BackupService.java importFromMarkdown path traversal
- CVE-2026-1812 bolo-blog bolo-solo Filename BackupService.java importFromCnblogs path traversal
- CVE-2026-1813 bolo-blog bolo-solo FreeMarker Template PicUploadProcessor.java unrestricted upload
Sources
Also known as GHSA-g4hj-43hm-xfc7.