CVE-2017-17536: Phabricator before 2017-11-10 does not block the --config and --debugger flags to the Mercurial hg program, wh

Q: How do I fix CVE-2017-17536?

phabricator: upgrade to 2017-11-10. Exact commands for each OS are on this page.

Q: Is CVE-2017-17536 being exploited?

CVE-2017-17536 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-17536 affect?

CVE-2017-17536 affects phabricator. Severity is high (CVSS 8.8). Phabricator before 2017-11-10 does not block the --config and --debugger flags to the Mercurial hg program, which allows remote attackers to execute arbitrary code by using the web UI to browse a branch whose name begins with a --config= or

This month

HIGH 8.8UPGRADE

CVE-2017-17536 is a high-severity flaw (CVSS 8.8) affecting phabricator. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Phabricator before 2017-11-10 does not block the --config and --debugger flags to the Mercurial hg program, which allows remote attackers to execute arbitrary code by using the web UI to browse a branch whose name begins with a --config= or --debugger= substring.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Published	2017-12-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: phacility

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

Am I affected?

Timeline

2017-12-11 07:29 UTCPublished CVE record published
2026-06-17 01:11 UTCUpdated Record last modified

phacility phabricator UPGRADE

Affected: < 2017-11-10

Fixed in: 2017-11-10

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2017-11-10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade phabricator

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade phabricator

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2017-17536?

phabricator: upgrade to 2017-11-10. Exact commands for each OS are on this page.

Is CVE-2017-17536 being exploited?

CVE-2017-17536 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-2017-17536 affect?

CVE-2017-17536 affects phabricator. Severity is high (CVSS 8.8). Phabricator before 2017-11-10 does not block the --config and --debugger flags to the Mercurial hg program, which allows remote attackers to execute arbitrary code by using the web UI to browse a branch whose name begins with a --config= or

How urgent is CVE-2017-17536?

Priority 51/100. High severity

References

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