CVE-2021-42838: Grand Vice info Co

Routine

MEDIUM 6.1DOWNGRADE

CVE-2021-42838 is a medium-severity flaw (CVSS 6.1) affecting webopac. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Grand Vice info Co. webopac7 book search field parameter does not properly restrict the input of special characters, thus unauthenticated attackers can inject JavaScript syntax remotely, and further perform reflective XSS attacks.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-11-15
Last modified	2026-06-17

Publisher (CNA): TWCERT/CC · Vendor: vice

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

Am I affected?

Timeline

2021-11-15 10:15 UTCPublished CVE record published
2026-06-17 04:10 UTCUpdated Record last modified

vice webopac DOWNGRADE

Affected: 1.8.20160701 · 7.1.20160701

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.8.20160701

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.8.20160701 (Debian / Ubuntu)

apt-cache madison webopac sudo apt install webopac=<VERSION_BEFORE_1.8.20160701> sudo apt-mark hold webopac

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

dnf --showduplicates list webopac sudo dnf downgrade webopac-<VERSION_BEFORE_1.8.20160701> sudo dnf versionlock add webopac

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-2021-42838?

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

Is CVE-2021-42838 being exploited?

CVE-2021-42838 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-2021-42838 affect?

CVE-2021-42838 affects webopac. Severity is medium (CVSS 6.1). Grand Vice info Co. webopac7 book search field parameter does not properly restrict the input of special characters, thus unauthenticated attackers can inject JavaScript syntax remotely, and further perform reflective XSS attacks.

How urgent is CVE-2021-42838?

Priority 34/100. No elevated risk signals yet.

Related CVEs

CVE-2021-42839 HIGH 8.8 DOWNGRADE Grand Vice info Co

References

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