CVE-2017-8298: cnvs.io Canvas 3.3.0 has XSS in the title and content fields of a "Posts > Add New" action, and during creatio

Routine

MEDIUM 5.4DOWNGRADE

CVE-2017-8298 is a medium-severity flaw (CVSS 5.4) affecting canvas. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

cnvs.io Canvas 3.3.0 has XSS in the title and content fields of a "Posts > Add New" action, and during creation of new tags and users.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-79
Published	2017-04-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cnvs

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-04-27 16:59 UTCPublished CVE record published
2026-06-17 01:26 UTCUpdated Record last modified

cnvs canvas DOWNGRADE

Affected: 3.3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.3.0

1. Check installed version

apt-cache policy canvas || rpm -q canvas || canvas --version

2. No fixed release: DOWNGRADE to a release before 3.3.0 (Debian / Ubuntu)

apt-cache madison canvas sudo apt install canvas=<VERSION_BEFORE_3.3.0> sudo apt-mark hold canvas

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list canvas sudo dnf downgrade canvas-<VERSION_BEFORE_3.3.0> sudo dnf versionlock add canvas

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-8298?

canvas: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-8298 being exploited?

CVE-2017-8298 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-8298 affect?

CVE-2017-8298 affects canvas. Severity is medium (CVSS 5.4). cnvs.io Canvas 3.3.0 has XSS in the title and content fields of a "Posts > Add New" action, and during creation of new tags and users.

How urgent is CVE-2017-8298?

Priority 31/100. No elevated risk signals yet.

Related CVEs

CVE-2020-8215 HIGH 8.8 UPGRADE A buffer overflow is present in canvas version <= 1.6.9, which could lead to a Denial of Service or execution
CVE-2017-1000507 MEDIUM 5.4 DOWNGRADE Canvs Canvas version 3.4.2 contains a Cross Site Scripting (XSS) vulnerability in User's details that can resu

References

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